Just curious if anyone has an answer to why my Samsung A54 will send screenshots or other pictures through sms/multimedia and other times it will not? I never know when it will fail or why. I don't have FB or any other means of sending. No 3rd party apps for texting. Just what my phone came with. I only use the one messages. The other I have turned off.
Samsung Messages is primarily SMS/MMS with some RCS if your carrier supports it.
Google Messages is RCS.
It's usually best to send large images, videos, and files via a Quick Share link.